The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2005
Filed:
Jan. 29, 2003
Toshio Takayama, Yamanashi, JP;
Mitsuhiro Endo, Yamanashi, JP;
Tetsuya Takahashi, Yamanashi, JP;
Shuzo Watanabe, Yamanashi, JP;
Tadaaki Nakamura, Yamanashi, JP;
Toshio Takayama, Yamanashi, JP;
Mitsuhiro Endo, Yamanashi, JP;
Tetsuya Takahashi, Yamanashi, JP;
Shuzo Watanabe, Yamanashi, JP;
Tadaaki Nakamura, Yamanashi, JP;
Kabushiki Kaisha Hitachi Seisakusho, Tokyo, JP;
Abstract
A valve bodyis connected to a power piston, which divides a housing into a constant pressure chamber (negative pressure) and a variable pressure chamber. In the valve bodythere is provided a brake assisting mechanismbetween a reaction diskand a plungerA poppet sealis opened by movement of the plungerto thereby introduce atmospheric air into the variable pressure chamber and generate a thrust force in the power piston. During rapid braking, a plunger rodadvances relative to a sleeveand ballsshift outward and the plunger roddirectly abuts against a reaction rodresulting in contraction of the brake assisting mechanismTherefore, the amount of movement of the plungercan be increased without being affected by a reaction force from the reaction diskthus enabling rapid development of servo power.